docs: fixed formatting of many manpages

docs/str.1

@@ -1,5 +1,5 @@
 .\" Copyright (c) 2023–2024 DTB <trinity@trinity.moe>
-.\" Copyright (c) 2023 Emma Tebibyte <emma@tebibyte.media>
+.\" Copyright (c) 2023–2024 Emma Tebibyte <emma@tebibyte.media>
 .\"
 .\" This work is licensed under CC BY-SA 4.0. To see a copy of this license,
 .\" visit <http://creativecommons.org/licenses/by-sa/4.0/>.
@@ -24,10 +24,10 @@ the function of the same name within ctype(3).
 .SH DIAGNOSTICS
 
 Str exits successfully if all tests pass and unsuccessfully if a test failed.
-.PP
+
 Str will exit unsuccessfully if a string is empty, as none of its contents
 passed the test.
-.PP
+
 Str will print a message to standard error and exit unsuccessfully if used
 improperly.
 
@@ -41,7 +41,7 @@ removed in favor of using strcmp(1) to compare strings against the empty string
 
 There's no way of knowing which argument failed the test without re-testing
 arguments individually.
-.PP
+
 If a character in a string isn't valid ASCII str will exit unsuccessfully.
 
 .SH AUTHOR